Hannip over at TreoCentral has written a keylight app for the 800w, I know this is one of the 'must have' apps/tweaks for me!!! Here is the post and the app itself. One thing to note is that since the key-lights work WITH the screen brightness on the 800w everytime you alter the brightness of your screen while running keylight, you have to run keylight again to turn the keys off again!!
http://discussion.treocentral.com/sh...01&postcount=1